Hi Daniel,
Daniel Borkmann wrote:
Hi everyone,
I am using an AMD Geode webcam with a V4L driver (lxv4l2). For the userspace I've implemented a V4L
binding with memory mapping of the frames. After sucessfull receiving frames it lasts about two or
three minutes and then either the timestamp of the frame is not changing anymore or a kernel oops
happens. I am not quite sure whether this is caused by my userspace test program ("fw_singapore")
or whether this is a bug within AMDs driver code ...
I while ago I've done some work on the Geode LX V4L driver. It was not
cleaned up enough to be submitted, but probably you'll find it useful.
http://compulab.co.il/workspace/mediawiki/index.php5?title=CM-iGLX:_Linux:_Video_Input_Port
Thanks for help.
Cheers,
Daniel
Here the causing driver function within AMDs lx.c (and below the dmesg output):
Nevertheless, I noticed that this function is also a potential deadlock candidate since
"spin_lock_irqsave(&io->lock, flags);" is called an the "else return 0;" does not release the lock.
/** lx_capt_resume2 - queue capture buffers to vip */
int
lx_capt_resume2(VidDevice *dp,io_queue *io)
{
io_buf *op, *ep;
int eidx, oidx, vip_buffers;
int task = dp->capt_vip_task;
int task_buffers = vip_task_data[task].task_buffers;
VIPINPUTBUFFER *vip_inpbfr = &dp->vip_inpbfr;
unsigned long flags;
struct list_head *lp;
io_buf *bp1;
dp->capt_stalled = 1;
task = dp->capt_vip_task;
task_buffers = vip_task_data[task].task_buffers;
if( dp->capt_addr_is_set == 0 ) {
op = dp->capt_toggle == capt_toggle_odd ? dp->capt_elch : dp->capt_onxt;
if( op == NULL ) {
if( list_empty(&io->rd_qbuf) != 0 )
{
// there are no more buffers into the input list for grabbing images,
// so requeue first output buffer into input list
spin_lock_irqsave(&io->lock, flags);
lp = &io->rd_dqbuf;
if( ! list_empty(lp) ) {
bp1 = list_entry(lp->next,io_buf,bfrq); // get the struct for this entry / list_entry ( ptr, type, member) &struct list_head pointer/ type of the struct this is embedded in/
name of the list_struct within the struct.
list_del_init(&bp1->bfrq); //deletes entry from list and reinitialize it
}
else return 0;
lp = &io->rd_qbuf;
list_move_tail(&bp1->bfrq,lp);
bp1->sequence = io->sequence++;
bp1->flags &= ~V4L2_BUF_FLAG_DONE;
bp1->flags |= V4L2_BUF_FLAG_QUEUED;
if( dp->capt_stalled != 0 )
{
DMSG(3,"------------ v4l_qbfr : capt != 0 && dp->capt_stalled != 0\n");
//v4l_capt_unstall(dp);
}
spin_unlock_irqrestore(&io->lock,flags);
//return 0;
}
op = list_entry(io->rd_qbuf.next,io_buf,bfrq);
list_del_init(&op->bfrq);
}
if( dp->capt_toggle == capt_toggle_both ||
dp->capt_toggle == capt_toggle_odd ) {
if( (ep=dp->capt_enxt) == NULL ) {
if( list_empty(&io->rd_qbuf) != 0 ) {
list_add(&op->bfrq,&io->rd_qbuf);
return 0;
}
ep = list_entry(io->rd_qbuf.next,io_buf,bfrq);
list_del_init(&ep->bfrq);
}
}
else
{
ep = op;
}
dp->capt_onxt = op; oidx = op->index;
dp->capt_enxt = ep; eidx = ep->index;
}
else
{
oidx = eidx = 0;
}
if( oidx != eidx ) {
vip_inpbfr->current_buffer = eidx;
vip_buffers = vip_task_data[task].vip_even_buffers;
vip_toggle_video_offsets(vip_buffers,vip_inpbfr);
vip_inpbfr->current_buffer = oidx;
vip_buffers = vip_task_data[task].vip_odd_buffers;
vip_toggle_video_offsets(vip_buffers,vip_inpbfr);
}
else {
vip_inpbfr->current_buffer = oidx;
vip_buffers = vip_task_data[task].vip_buffers;
vip_toggle_video_offsets(vip_buffers,vip_inpbfr);
}
dp->capt_stalled = 0;
++dp->capt_sequence;
++dp->capt_jiffy_sequence;
return 1;
}
dmesg and uname:
nao@purzel [1] [~]$ uname -a
Linux purzel 2.6.29.6-rt24-aldebaran-rt #1 PREEMPT RT Fri Feb 12 17:51:46 CET 2010 i586 GNU/Linux
[ 17.877211] AMD Linux LX video2linux/2 driver 3.2.0100
[ 17.893218] Found Geode LX VIP at IRQ 11
[ 17.910414] OmniVision ov7670 sensor driver, at your service (v 2.00)
[ 17.939093] ov7670/1: driver attached: adapter id: 10002
[ 17.955545] Trying to detect OmniVision 7670/7672 I2C adapters
[ 19.847126] ov7670_init returned 0
[ 19.847139] Phase 1
[ 19.849429] Phase 2
[ 19.849440] Phase 3
[ 19.851728] Phase 4
[ 19.851739] Phase 5
[ 19.854054] Phase 6
[ 19.854064] Phase 7
[ 19.856357] Phase 8
[ 19.856367] Phase 9
[ 19.856377] OmniVision 7670/7671 I2C Found
[ 19.868799] ov7670/1: driver attached: adapter id: 0
[ 20.324975] eth0: link up, 100Mbps, full-duplex, lpa 0x45E1
[ 22.963201] spurious 8259A interrupt: IRQ7.
[ 74.863542] warning: `vsftpd' uses 32-bit capabilities (legacy support in use)
[ 565.626822] BUG: unable to handle kernel paging request at 0519e544
[ 565.627024] IP: [<cf4bc988>] vip_toggle_video_offsets+0x29/0x106 [cimarron]
[ 565.627024] *pde = 00000000
[ 565.627024] Oops: 0000 [#1] PREEMPT
[ 565.627024] last sysfs file: /sys/class/i2c-adapter/i2c-1/1-004c/temp1_input
[ 565.627024] Modules linked in: lxv4l2 cimarron zd1211rw ftdi_sio usbserial lm90 scx200_acb i2c_serial
[ 565.627024]
[ 565.627024] Pid: 1557, comm: IRQ-11 Not tainted (2.6.29.6-rt24-aldebaran-rt #1) AMD "CM-iGLX" Geode LX/CS5536
[ 565.627024] EIP: 0060:[<cf4bc988>] EFLAGS: 00010246 CPU: 0
[ 565.627024] EIP is at vip_toggle_video_offsets+0x29/0x106 [cimarron]
[ 565.627024] EAX: 00000000 EBX: cdb86e24 ECX: cf428000 EDX: ce382c88
[ 565.627024] ESI: cdb86e2c EDI: cdb86e24 EBP: ce382c88 ESP: ce359f28
[ 565.627024] DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068 preempt:00000001
[ 565.627024] Process IRQ-11 (pid: 1557, ti=ce359000 task=ce0617f0 task.ti=ce359000)
[ 565.627024] Stack:
[ 565.627024] cdb86e1c ce38281c cf43d926 cdb86e04 00000000 00000000 ce382800 00000001
[ 565.627024] 00000000 cf43ebe0 00075a8d 00040d9a 00000001 00000000 00000000 00000001
[ 565.627024] ce38281c cdb86e00 00dc9c86 c0393f64 cda15b20 0000000b 00000000 c013e758
[ 565.627024] Call Trace:
[ 565.627024] [<cf43d926>] ? lx_capt_resume2+0x199/0x1bd [lxv4l2]
[ 565.627024] [<cf43ebe0>] ? lx_interrupt+0x67d/0x785 [lxv4l2]
[ 565.627024] [<c013e758>] ? handle_IRQ_event+0x83/0x13f
[ 565.627024] [<c013e9e8>] ? thread_simple_irq+0x3a/0x72
[ 565.627024] [<c013eac2>] ? do_irqd+0xa2/0x24d
[ 565.627024] [<c013ea20>] ? do_irqd+0x0/0x24d
[ 565.627024] [<c012c5b9>] ? kthread+0x36/0x5a
[ 565.627024] [<c012c583>] ? kthread+0x0/0x5a
[ 565.627024] [<c0102fb3>] ? kernel_thread_helper+0x7/0x10
[ 565.627024] Code: 5f c3 56 53 89 c1 8b 9a e4 00 00 00 85 c0 75 33 f6 02 02 8b 0d 60 13 4d cf 8d 73 08 74 0d 8b 44 9a 04 89 41 1c 8b 54 b2 0c eb 0b <8b> 44 b2 0c 89 41 1c 8b 54
9a 04 a1 60 13 4d cf 89 50 18 e9 c0
[ 565.627024] EIP: [<cf4bc988>] vip_toggle_video_offsets+0x29/0x106 [cimarron] SS:ESP 0068:ce359f28
[ 565.627024] CR2: 000000000519e544
[ 566.207813] ---[ end trace d33f57cfaa8188ac ]---
[ 566.230208] BUG: unable to handle kernel paging request at 0519e544
[ 566.231021] IP: [<cf4bc988>] vip_toggle_video_offsets+0x29/0x106 [cimarron]
[ 566.231021] *pde = 00000000
[ 566.231021] Oops: 0000 [#2] PREEMPT
[ 566.231021] last sysfs file: /sys/class/i2c-adapter/i2c-1/1-004c/temp1_input
[ 566.231021] Modules linked in: lxv4l2 cimarron zd1211rw ftdi_sio usbserial lm90 scx200_acb i2c_serial
[ 566.231021]
[ 566.231021] Pid: 1751, comm: fw_singapore Tainted: G D (2.6.29.6-rt24-aldebaran-rt #1) AMD "CM-iGLX" Geode LX/CS5536
[ 566.231021] EIP: 0060:[<cf4bc988>] EFLAGS: 00010246 CPU: 0
[ 566.231021] EIP is at vip_toggle_video_offsets+0x29/0x106 [cimarron]
[ 566.231021] EAX: 00000000 EBX: cdb86e24 ECX: cf428000 EDX: ce382c88
[ 566.231021] ESI: cdb86e2c EDI: cdb86e24 EBP: ce382c88 ESP: ce2dee44
[ 566.231021] DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 0068 preempt:00000001
[ 566.231021] Process fw_singapore (pid: 1751, ti=ce2de000 task=cd8aa030 task.ti=ce2de000)
[ 566.231021] Stack:
[ 566.231021] cdb86e1c ce38281c cf43d76a 00000000 cdb86e58 cdb86e00 cdb86e1c ce38281c
[ 566.231021] cf4375be 00000001 cdb86e04 cdb86e00 00000001 bfeae7b0 c044560f cf43c393
[ 566.231021] 00000001 ce2def50 ce2def4c 00000000 cddef740 ce2deea8 0000000d c0275b89
[ 566.231021] Call Trace:
[ 566.231021] [<cf43d76a>] ? lx_capt_resume+0x108/0x12b [lxv4l2]
[ 566.231021] [<cf4375be>] ? v4l_qbfr+0x72/0x88 [lxv4l2]
[ 566.231021] [<cf43c393>] ? vid_ioctl+0x35c4/0x3d65 [lxv4l2]
[ 566.231021] [<c0275b89>] ? sys_recvfrom+0xb1/0x113
[ 566.231021] [<c0275bd9>] ? sys_recvfrom+0x101/0x113
[ 566.231021] [<c014b731>] ? perf_swcounter_event+0xc4/0xeb
[ 566.231021] [<cf438dcf>] ? vid_ioctl+0x0/0x3d65 [lxv4l2]
[ 566.231021] [<c021cedb>] ? v4l2_ioctl+0x31/0x34
[ 566.231021] [<c01709d8>] ? vfs_ioctl+0x47/0x5d
[ 566.231021] [<c0170f01>] ? do_vfs_ioctl+0x43f/0x47f
[ 566.231021] [<c0275c04>] ? sys_recv+0x19/0x1d
[ 566.231021] [<c0276003>] ? sys_socketcall+0xf2/0x18c
[ 566.231021] [<c0170f6d>] ? sys_ioctl+0x2c/0x42
[ 566.231021] [<c0102851>] ? syscall_call+0x7/0xb
[ 566.231021] Code: 5f c3 56 53 89 c1 8b 9a e4 00 00 00 85 c0 75 33 f6 02 02 8b 0d 60 13 4d cf 8d 73 08 74 0d 8b 44 9a 04 89 41 1c 8b 54 b2 0c eb 0b <8b> 44 b2 0c 89 41 1c 8b 54
9a 04 a1 60 13 4d cf 89 50 18 e9 c0
[ 566.231021] EIP: [<cf4bc988>] vip_toggle_video_offsets+0x29/0x106 [cimarron] SS:ESP 0068:ce2dee44
[ 566.231021] CR2: 000000000519e544
[ 566.894334] ---[ end trace d33f57cfaa8188ad ]---
--
Sincerely yours,
Mike.
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